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农田土壤的压实在国外受到很大重视,已经成为免耕理论的主要内容之一,它实际上也是太湖地区三麦免耕的重要依据。当地秋耕时经常遇到多雨气候(据统计为三年一遇),另外因为稻田地下水位高,土壤粘重持水力强等,致使秋耕时除了一小部份已建有地下暗营,排水条件特好的农田外,大部分农田都被迫在过湿情况下进行耕作,作业后田间被压成一条条轮辄,以中型拖拉机旋耕为例,作业幅宽175厘米,轮压面宽为35×2=70厘米,一次作业受压面积为40%。即使
Compaction of farmland soil has received great attention abroad and it has become one of the main contents of no-till theory. It is also an important basis for no-tillage of Sanmai in Taihu Lake area in fact. In autumn, the rainy weather is often encountered in autumn (according to statistics once in three years). In addition, due to the high groundwater level in the paddy field and the strong water holding capacity of the soil, Most of the farmland is forced to tillage under excessive wet conditions. After fieldwork, the farmland is pressed into strips. Taking a medium-sized tractor rotary tillage for example, the working width is 175 cm. The width is 35 × 2 = 70 cm, a work pressure area of 40%. even if